my pencil is in my home和mine is at home那个对?为什么?

my pencil box is in my My pencil box is in my r(.) My pen is in my pencil case.(对in my pencil case提问) My pencil and my eraser（is）in my pencil bok.为什么要用is? my pencil is ____ my pencil case My pen is in my pencil case.(改为一般疑问句) my ,my ,schoolbag ,in ,is ,pencil box(连词成句) There is a pen in my pencil case改为I () a pen in my pencil case my pen is in pencil case 哪里错了? My pen is in the pencil case改为一般疑问句? my eraser is in the pencil box.(改为一般疑问句) is,the,my,box,pencil,in,eraser.连词成句 my eraser is in the pencil case改为疑问句 My pen is in pencil case.哪里错了? My pen is in pencil case.中有处错误请改正 There is n______ but a rencil in my pencil case. 改错：The pen in your pencil box is newer than it in my pencil box． my ruler is in the pencil bok 对in the pencil bok提问